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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-Based Compensation |  |  |  |
Share-based compensation, remaining shares available for issuance (in shares) | 4,726,107 |  | 4,726,107 |
Stock-based compensation (income) expense (in dollars) | $ (0.5) |  | $ 5.4 |
Director |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 77,608 | 50,673
Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 250,432 | 210,243
Vesting period (in years) |  |  | 3 years |
Expiration period (in years) |  |  | 10 years |
Restricted Stock Units |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 305,519 | 178,371
Vesting period (in years) |  |  | 3 years |
Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) | 0 | 0 | 328,310 | 228,037
Vesting period (in years) |  |  | 3 years |
Engineering, Selling and Administrative Expense |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation (income) expense (in dollars) | $ 2.0 | $ 2.2 | $ 7.9 | $ 8.3
Restructuring Charges |  |  |  |
Stock-Based Compensation |  |  |  |
Stock-based compensation (income) expense (in dollars) | $ (2.5) |  | $ (2.5) |
2013 Omnibus Plan |  |  |  |
Stock-Based Compensation |  |  |  |
Share-based compensation, shares authorized (in shares) | 7,477,395 |  | 7,477,395 |
Performance Shares 2020 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Performance period (in years) |  |  | 3 years |
Increase decrease in percentage of shares paid based on total shareholder return relative to defined peer group |  |  | 20.00% |
Performance Shares 2020 | Performance Shares | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares of other than options granted during the period |  |  | 200.00% |
Performance Shares 2019 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Performance period (in years) |  |  |  | 3 years
Percentage of shares paid based on total shareholder return relative to defined peer group (as a percent) |  |  |  | 50.00%
Percentage of shares paid based on adjusted EBITDA (as a percent) |  |  |  | 50.00%

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